enter vs keep

enter is not a noun while keep is a noun.

Word	Noun	Adjective	Verb	Adverb
enter	No	No	Yes	No
keep	Yes	No	Yes	No

As verbs, keep is a hyponym of enter; that is, keep is a word with a more specific, narrower meaning than enter:

enter (noun)	keep (noun)
	the main tower within the walls of a medieval castle or fortress
	a cell in a jail or prison
	the financial means whereby one lives

enter (verb)	keep (verb)
set out on (an enterprise or subject of study)	prevent (food) from rotting
make a record of; set down in permanent form	prevent the action or expression of
become a participant; be involved in	stick to correctly or closely
put or introduce into something	maintain by writing regular records
come on stage	supply with necessities and support
to come or go into	hold and prevent from leaving
take on duties or office	retain possession of
register formally as a participant or member	look after; be the keeper of; have charge of
be or play a part of or in	retain rights to
	maintain for use and service
	have as a supply
	store or keep customarily
	stop (someone or something) from doing something or being in a certain state
	allow to remain in a place or position or maintain a property or feature
	conform one's action or practice to
	behave as expected during of holidays or rites
	cause to continue in a certain state, position, or activity
	supply with room and board
	maintain in safety from injury, harm, or danger
	fail to spoil or rot
	continue a certain state, condition, or activity
	to rear